Spring Autumn Period Jade Cong. H.9cm, W. 7cm. The cong has the shape of square cube with four wing opening phoenix holding the four corner. The four sides of the cong are decorated with lying silkworms and auspicious clouds which have the Spring Autumn low relief carving style. Antiquity evidences include cleaving vein, dissolved pit and calcification( Lower right image is a Western Zhou Dynasty jade cong)